Company email (March 2013):
"I think out other beers, the Naked Pig, Kudzu Porter and Freckle Belly IPA would be considered vegan friendly in the bottle or draft, however the cask versions which we do occasionally would not since they usually contain isinglass."
Back Forty Kudzu
Vegan
This product is listed as vegan friendly.
What the company told us
Correspondence on record, with the date of each entry.